Functional constipation is a common disorder of the gastrointestinal tract in children without specific treatment. Ziziphus jujuba has been used in traditional medicine for various diseases such as constipation. A safe and inexpensive treatment with few side effects can be used as an effective alternative to current medications. In this study, we sought to compare Ziziphus jujuba syrup (ZS) with polyethylene glycol (PEG) for the treatment of pediatric functional constipation. A double-blind, randomized clinical trial was performed on children aged 2–10 years with functional constipation who were referred to the gastroenterology clinic of the 17-Shahrivar Hospital in Rasht, Iran. Eligible patients were randomized into two groups: PEG group; 1–5 cc/kg/day (40% w/v solution without electrolytes; average dose: 0.2–1 g/kg), and ZS group; 1–5 cc/kg/day (average dose: 5–25 mg/kg). All patients were followed up for three months, every 2 weeks in the first month, and then monthly for 2 months. At the beginning and end of the study, liver and kidney function tests and blood sugar levels were checked. Data were analyzed using SPSS software version 19 at a significance level of 0.05. Out of 90 eligible children, 32 patients in the PEG group and 30 patients in the ZS group completed the follow-up visits. The mean age of the subjects was 4.31 ± 1.97 years. There was no significant difference between the two groups in terms of age (P = 0.181), gender (P = 0.218), age at onset of constipation (P = 0.083), and weight (P = 0.199). The average therapeutic response score in the ZS group improved prominently compared to the PEG group (P < 0.05). The average number of encopresis and visual analog scale pain scores significantly decreased in the ZS group compared to the PEG group (P < 0.05). Other indices, including frequency of defecation, and medication adherence in the ZS group were significantly improved compared to the PEG group (P < 0.05). Only in the PEG group, a few cases reported self-limiting side effects. ZS can be a treatment choice for functional constipation without any adverse events or liver or kidney injury in children. However, further studies are necessary to find potential side effects.
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